Table 1. Results of the regression analyses relating percentages of Varroa-infested brood removed for whole comb and brood section of donor frames, and brood removal of brood section to different measurements related to hygiene.

	Overall			Italian			Russian
Measurement	R	r2	P value	r	r2	P value	r	r2	P value
A. % Varroa-infested brood removed (donor comb)
% Varroa-infested brood removed (brood section of donor comb)	0.55	0.30	< 0.001	0.23	0.05	0.474	0.51	0.26	< 0.01
% brood removal (brood section of donor comb)	0.36	0.13	< 0.05	-0.17	0.03	0.586	0.45	0.20	< 0.05
% manipulated brood (brood section of donor comb)	0.39	0.15	< 0.05	-0.14	0.02	0.661	0.46	0.21	< 0.05
% infestation (resident brood)	-0.43	0.18	< 0.01	-0.27	0.07	0.414	-0.31	0.10	0.090
% of NR foundresses* (resident brood)	0.24	0.06	0.111	0.30	0.09	0.100	0.01	0.0001	0.960
% recapped cells (resident brood)	0.22	0.04	0.146	0.36	0.13	0.241	0.10	0.01	0.571
B. % Varroa-infested brood removed (brood section of donor comb)
% brood removal (brood section of donor comb)	0.31	0.10	< 0.05	0.29	0.08	0.354	0.25	0.06	0.191
% manipulated brood (brood section of donor comb)	0.32	0.10	< 0.05	0.30	0.09	0.343	0.23	0.05	0.231
C. % brood removal (brood section of donor comb)
% initial infestation (brood section of donor comb)	0.57	0.32	< 0.001	0.20	0.04	0.532	0.66	0.44	< 0.001
% infestation (resident brood)	-0.5	0.25	< 0.001	-0.18	0.03	0.558	-0.53	0.28	< 0.01
% of NR foundresses* (resident brood)	0.38	0.14	< 0.05	0.05	0.003	0.857	0.46	0.21	< 0.05
% recapped cells (resident brood)	0.35	0.12	< 0.05	0.28	0.08	0.376	0.28	0.08	0.131

Percentage of Varroa-infested brood removed was calculated as the % change in Varroa infestation of donor combs.

*NR = no progeny produced.